<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Page Info</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <div class="container">
    <h1>当前页面信息</h1>
    <p id="title">标题：加载中...</p>
    <p id="url">URL：加载中...</p>
    <button id="changeBg">随机背景色</button>
  </div>
  <script src="popup.js"></script>
</body>
</html>